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CX20431-21 参数 Datasheet PDF下载

CX20431-21图片预览
型号: CX20431-21
PDF下载: 下载PDF文件 查看货源
内容描述: AccessRunner ADSL -USB调制解调器设备设置 [AccessRunner ADSL-USB Modem Device Set]
分类和应用: 调制解调器
文件页数/大小: 56 页 / 363 K
品牌: CONEXANT [ CONEXANT SYSTEMS, INC ]
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AccessRunner ADSL-USB Modem Device Set Data Sheet  
4.1.5  
Enumeration  
The enumeration process consists of the following steps:  
1. Get device descriptor. The host requests and reads the device descriptor to determine maximum packet size.  
2. Set address. The host sends the function address in a data packet using function endpoint 0. Device firmware interprets  
this data.  
3. Get device descriptor. The host requests and reads the device descriptor to determine such information as device class,  
USB Specification compliance level, maximum packet size for endpoint 0, vendor id, product id. Etc.  
4. Get configuration descriptor. The host requests and reads the device configuration descriptor to determine such  
information as the number of interfaces and endpoints; endpoint transfer type, packet size, and direction; power source  
;maximum power; etc. When the host requests the configuration descriptor, all related interface and endpoint descriptors  
are returned.  
5. Set configuration. The host assigns a configuration value to the device to establish the current configuration.  
4.1.6  
Endpoint Pairs  
Data transfers with the host are made to/from endpoint pairs on the USB module. The five function endpoint pairs are listed in  
Table 4-5.  
Table 4-5. Endpoint Pairs  
Endpoint Pair  
Max. Packet Size  
Max. Packet Size  
USB Data Transfer Types  
Function Endpoint 0  
Function Endpoint 1  
Function Endpoint 2  
Function Endpoint 3  
Function Endpoint 4  
64 bytes  
64 bytes  
64 bytes  
64 bytes  
64 bytes  
64 bytes  
64 bytes  
64 bytes  
Control  
Bulk  
Bulk  
Bulk  
Bulk  
64 bytes  
64 bytes  
4.1.7  
Language ID Table  
See Language ID data in Table 4-6.  
Table 4-6. Language ID Table  
Offset  
Field  
Size  
Value  
Default  
(Hex.)  
Description  
0
1
2
bLength  
bDescriptorType  
1
1
2
Number  
Constant  
Number  
04  
03  
Size of this descriptor in bytes.  
INTERFACE Descriptor Type.  
0409  
4.1.8  
Manufacturer String Table  
See Manufacturer String data in Table 4-7.  
Table 4-7. Manufacturer String Table  
Offset  
Field  
Size  
Value  
Default  
(Hex.)  
Description  
0
1
2
bLength  
bDescriptorType  
1
1
2
Number  
04  
03  
00  
'-'  
Size of this descriptor in bytes.  
Constant  
INTERFACE Descriptor Type.  
Manufacturer string, in unicode  
4-6  
Conexant  
100427B  
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